Richard montgomery



RICHARD MONTGOMERY, OF NEW YORK, N. Y.

SCREW EXCAVATOR.

Speccaton of Letters Patent No. 24,043, dat-ed May 17, 1859i.

To all whom it may concern.' l

Be it known that I, RICHARD MONTGOM- ERY, of the city of `New York andState of New York, have invented an Improved Archimedean-ScrewExcavator; and I do hereby declare that the following is a fullv andexact description of its construction and operation, 'reference beinghad to the accompanying drawings, and to the letters of reference markedthereon, so as to enable others skilled in the art to make and use myinvention. j

Figure l, Plate I, of the drawings represents a perspective view of the.machine; Fig. 2, of Plate II, is a side view of the cylinder when atwork, Fig. 3, of Plate II, is an end view of the cylinder exhibiting amodification of the arrangement of Darts as shown in Plate I andin Fig.2 of Plate II.

The excavating cylinder a l), is made conical in form, the upper ordischarging end a, being much larger than the lower end. The cylindercontains a screw thread as indicated by red lines in Plate I, andis openat both ends as seen at c, and The sharp cutting edges lo, 1c, arewelded or otherwise firmly attached to the onen end l), which is incontact with the soil to be excavated.

The other or discharging end of the cylinder is open at c, and aninclined trough j, is arranged underneath'the opening c, so as toreceive the earth as it is discharged from the cylinder, and convey itout of the track of the machine. The journal Z, at the rear end of thecylinder has its bearing in the cross bar u, of the frame s, u, s.

There is a projection f, around the cylinder near its end b. Thisprojection bears against friction rollers it, which project throughslots in a ring g (the slots are not seen in the figures) and have theirbearings in staples z' projecting from the outside of the ring. The ringis also provided with a stirrup m, to which a rope or chain n, isfastened, which passes over a pulley o, at the outer end of a standardp, and is also fastened to this standard at g.

The pivot at the lower end of the standard or derrick p, has its bearingin a socket in the table t, so as to allow the derrick to be swunground.

The lower ends of the frame s, .9, are pivoted to the ring g, at 1',while the upper end of s, is pivoted to a block d, at c', and the upperend of s, has a bearing on shaft z, at o. The shaft a, is the drivingshaft `consists of frame s, a,

and motion may be communicated toitvin any suitable manner. The shaft a,has its bearings in blocks Z9', c', and carries near its inner end abevel wheel y, which takes into another bevel wheel m, upon the end of ashaft s, which shaft z, has its bearings in blocks projecting from frame8, and

lcarries a cogwheel e, at its other end.

Thei. cogwheel c, takes into cogs cl, arranged around the cylinder. Thusit will be seen the cylinder will be caused to revolve as soon as thedriving shaft s, is set in motion, and at'the same time the excavatingend of the cylinder can be lifted' or lowered by means of chain n, thewholesystem which supports the cylinder and which fulcrumed at fu, e.

The earthv as it is dug up by the edges lo, ft, is worked up through thecylinder by means of the screw thread, inside of the cylinder, and isfinally discharged at c.

An endless band Z, Z, passing over rollers 2', i, pivoted to arms j, j,extending from frame u, might be substituted for the inclined trough yrepresented in Fig. 3, of Plate II.

The blocks Z9', c', and cl', are arranged on a beam z", extending fromtable h. The latter is supported on four wheels two of which are shownat y', j, Plate I, for the purpose of moving the whole machine along asthe excavation proceeds.

Fig. 2, Plate II, represents the cylinder in the act of excavating; A,B, C, representing the soil to be excavated and B, C, D, A',representing the semicylindric space that has been dug out by themachine.

At 7c, lo, the earth is seen as it enters the cylinder and at c, as itis discharged over the incline j. The cylinder is made larger at theupper end as aboveset forth, in order to ease the progress of the earthas it is worked up toward the discharge opening c.

In harmony with. the principle of mechanics that the driving power oughtto be applied as near the point of resistance as possible, the coggearing e, CZ, is arranged as near the excavating end b, of the cylinderas may be done without exposing the cogs d, to come too close to andeventually in contact with the soil, whereby the action of the machinewould be seriously impeded. Another object inl arranging the cog gearinge, d, as near the excavating end of the cylinder as possible, is toprevent an undue s, and ring g, ,beingV This modification is dotted redline) is attached to the outer end of the derrickrp, so that a person onthe table or platform k, of the carriage K, may take hold of the otherend of said rope L,

and by pulling it, cause the derrick to swing round and thereby raisethe excavating end of the cylinder when4 desirable without unhitchingthe rope or chain n. The cutting edges k, k, also serve to out up stumpsembedded in the ground.

When using an endless belt Z, Z, the weight of the earth falling upon itwill help to move the belt forward and around the rollers i, i. Y

It will be understood that more than one screw 'thread a', could beinserted in the cylinder, s0 as to facilitate still more the res movalof the earth from the excavating end of the cylinder to the dischargeend.

Having described my improved Archimedean screw excavator what I claimtherein as new and desire to secure by Letters Patent, is: Y

1. Making the cylinder a b, which incloses the screw a', in a conicalform, for the purpose of rendering the ascent and discharge of the earthmore free and perfect as set forth.

2. Supporting the cylinder and screw by means of the hinged frame u, s,s, substantially as and for the purposes set forth.

S. Driving the cylinder a b, and screw a, by means of the gearing y, w,e, cl, arranged and combined VasV described.

4. Supportingv and adjusting the front of the excavator by means of thefriction ring g, and chain or rope n, as above described.

5. The curved, swinging standard or derrick p, for elevating the frontend of the excavator without unfastening the chain n, when desired, asdescribed.

6. The combination of the cylinder a Z), and screw a', with the swingingframe u, s, s', derrick p, and carriage K, substantially as herein setforth.

R. MONTGOMERY.

Witnesses:

A. WIDDICOMBE, M. C. GRITZNER.

